Emerson Liebert Challenger ITR - Manual (Page 22)

Water/Glycol-Cooled Systems—Standard and Optional Features
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8.4 Water/Glycol-Cooled, Split System—Optional Features
High Pressure
The high pressure option for the condenser circuit consists of a two-way or three-way water regulat-
ing valve and condenser rated at 350 psig (2413 kPa) water pressure. This option is required in appli-
cations with large static heads.
Factory Installed Non-Fused Disconnect Switch
Allows unit to be turned off for maintenance. Disconnect switch is available on indoor condensing
units only.
70/30 Cu-Ni Econ-O-Coil
This coil replaces the standard copper tube coil to provide improved resistance to corrosion. This
option must be specified whenever a GLYCOOL or Dual Cooling Source system is applied to a cooling
tower loop or other open water system.
8.4.1 Glycol-Cooled System—Heat Rejection Devices
8.4.2 Self-Contained and Split Systems
Fan Speed Control Drycooler
The Liebert manufactured Fan Speed Control drycooler is constructed of aluminum and features cop-
per tubes and aluminum fin design. It is low profile, propeller fan type and provides quiet, trouble
free heat rejection. The drycooler features a variable speed fan motor and a specially engineered solid
state fan speed transducer. The transducer senses the temperature of the leaving glycol and modu-
lates the speed of the fan to maintain proper glycol temperatures. An integral, factory-wired and
tested control panel reduces installation time.
Glycol Pump
The glycol system includes a matching centrifugal glycol pump. It is mounted in a vented, weather-
proof enclosure. Optional Equipment—See page 16.